How much work do you have to do to a 202 to get it anywhere near a stock 940? For what i'm planning to do, either way I think i'll be pocketting the block...

_________________

Do you mean a (12G)295 which is the small bore version of the (12G)940?

_________________

I meant just a 12G202. Are the valves further apart on a 940 over a 202/295?

_________________

If you DO mean a 202 vs a 12G940, it'll take quite a lot of work, and $$$. But it will have more torque (on a smallbore motor) than a 940 (on a pocketed block) will. So GR told me.
You won't need to pocket the block with a 202, unless you fit over 27mm diameter exhaust valves. The chambers are deeper than in 1275 heads.

Yes, further apart on a 1275. Exhausts further out.

I do like a 12G940 (or a 12G1316) on 1098s though (with block notched). Easy HP with little head work needed.
Here's one I prepared earlier (was going on JAM's old 1098 donk I bought)

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

When you say torque... is that 'drivable lower rpm torque'?

What about between 4000-6500 rpm (and even above ) ???

_________________

Am I rite this is the 850 Motor your talking about as I know if its the 998/1098 with a 940 head you will need to pocket the Block. No idea about the 850 block thou. Which ever way the 202 head will need more hours of work to get it as good as a 940 head but in saying that Im lead to believe the 202 can be worked better than a 940 head

_________________
Stop Licking the Dog...I Don't Care Who Started It

Yes will be based on an 848 engine. Will have 998 pistons, and I presume the centre of the bores in an 850 is the same as a 998/1098??

_________________

what diff ratio and top gear RPM are you looking for?

whats the original height of the 202 head? and whats the most you can you deck them, is it around 90thou??

_________________
(KILL #53) Help MotherEarth, squash a Bug.

First time out with it I think i'll try just a 3.44 in it. 3750rpm @100kph/62mph. I am aiming for 100mph first time out, so thats 6000rpm. A ballanced 850 crank shouldn't kill itself at that.

97mph would give me the Australian record for I/PRO, but there's a guy who's done 102mph in J/PRO (up to 750cc)... so i'd have to be faster than him.

_________________

a 3.44 diff will kill an 850, with or without 998 pistons in it. I'd go with the 3.765, or maybe a 3.647.
It'll have to rev real hard to do 100MPH.

And a 940 head is too big too.
Heck, the old Cooper S head was really too big on a 970S..

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

It only has to struggle under say 3500rpm. It will never be a road engine. Single purpose is to go as fast as it can on the salt.

_________________

well if it's a Mini body, wind resistance sets in bad about 85MPH.
Sooner in a Moke...

HP needed increases as the square of the speed.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Is a clubman more aero efficient??? Hehehehehe.

_________________

Hardly.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.